REVIEW AND SOME STUDIES OF ELECTROKINETIC PHENOMENA

THIS ARTICLE REVIEWS DIFFERENT ELECTROKINETIC PHENOMENA IN POROUS MEDIA, ESPECIALLY THE THEORY AND APPLICATION OF ELECTRO-OSMOSIS IN SOIL. DIFFERENT THEORIES OF ELECTRO- OSMOSIS BY HELMHOLTZ, SMOLUCHOWSKI AND WINTERKORN-SCHMID ARE CITED AND CRITICALLY REVIEWED. AS MICROSCOPIC THEORIES, THEY REQUIRE SOME PROCEDURE TO EVALUATE THE MACROSCOPIC CONDUCTIVITY COEFFICIENTS. IT IS SHOWN THAT THE LINEAR RELATIONS BETWEEN FLUX AND POTENTIAL GRADIENT CAN BE DEDUCED FROM PURELY MECHANISTIC CONSIDERATIONS. THE DRAG FORCES IMPOSED BY FLOWING WATER ON SOIL PARTICLES WERE STUDIED. THE RATIO BETWEEN THE DARCY HYDRAULIC CONDUCTIVITY AND THE ELECTRO-OSMOTIC COEFFICIENT WAS FOUND TO BE APPROXIMATELY CONSTANT. A MORE RIGOROUS PRESENTATION OF THE PARTIAL DIFFERENTIAL EQUATIONS OF FLOW WAS MADE, CONSIDERING ALSO A NON-STABLE DEFORMABLE SOIL. MANY UNRELATED EXPERIMENTAL OBSERVATIONS COULD THUS BE CORRELATED WITH THE THEORY AND SOME COULD BE PREDICTED. FOR EXAMPLE IT WAS SHOWN THAT, UNDER STEADY-STATE FLOW WITH NO HYDRAULIC HEAD GRADIENT, CONSOLIDATION CAN TAKE PLACE ONLY IF THE SOIL IS NON-UNIFORM . A NUMBER OF WELL-KNOWN APPLICATIONS ARE BRIEFLY REVIEWED. OTHER POSSIBLE APPLICATIONS, SUCH AS THE PREVENTION OF MUD STICKING TO METAL IMPLEMENTS AND TEMPORARY STRENGTHENING OF SOIL, ARE PRESENTED, WITH REFERENCE TO RECENT EXPERIMENTAL WORK BY THE AUTHORS. A MORE GENERAL AND FUNDAMENTAL DISCUSSION OF THE ELECTRO-OSMOTIC PHENOMENA IS PRESENTED, BASED ON THE THEORY OF THE THERMODYNAMICS OF IRREVERSIBLE PROCESSES. THIS STANDARD FORMULATION FAILS DUE TO NON- LINEARITY OF THE PHENOMENA. AN ALTERNATIVE FORMULATION IS SUGGESTED. /AUTHOR/

  • Corporate Authors:

    Butterworths and Company, Limited

    2265 Midland Avenue
    Scarborough, Ontario  Canada 
  • Authors:
    • Zaslavsky, D
    • Ravina, I
  • Publication Date: 1965

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00228876
  • Record Type: Publication
  • Report/Paper Numbers: pp 55-69
  • Files: TRIS
  • Created Date: Aug 15 2004 2:10AM